Store everything in XDG_CONFIG_HOME, add `status` command

auth/auth.go

@@ -13,10 +13,13 @@ import (
 	"golang.org/x/crypto/nacl/secretbox"
 	"golang.org/x/crypto/openpgp"
 
+	"github.com/emersion/hydroxide/config"
 	"github.com/emersion/hydroxide/protonmail"
 )
 
-const authFile = "auth.json"
+func authFilePath() (string, error) {
+	return config.Path("auth.json")
+}
 
 type CachedAuth struct {
 	protonmail.Auth
@@ -26,7 +29,11 @@ type CachedAuth struct {
 }
 
 func readCachedAuths() (map[string]string, error) {
-	f, err := os.Open(authFile)
+	p, err := authFilePath()
+	if err != nil {
+		return nil, err
+	}
+	f, err := os.Open(p)
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {
@@ -40,7 +47,11 @@ func readCachedAuths() (map[string]string, error) {
 }
 
 func saveAuths(auths map[string]string) error {
-	f, err := os.Create(authFile)
+	p, err := authFilePath()
+	if err != nil {
+		return err
+	}
+	f, err := os.Create(p)
 	if err != nil {
 		return err
 	}
@@ -123,6 +134,19 @@ func authenticate(c *protonmail.Client, cachedAuth *CachedAuth, username string)
 	return c.Unlock(auth, cachedAuth.MailboxPassword)
 }
 
+func ListUsernames() ([]string, error) {
+	auths, err := readCachedAuths()
+	if err != nil {
+		return nil, err
+	}
+
+	l := make([]string, 0, len(auths))
+	for username, _ := range auths {
+		l = append(l, username)
+	}
+	return l, nil
+}
+
 func GeneratePassword() (secretKey *[32]byte, password string, err error) {
 	var key [32]byte
 	if _, err = io.ReadFull(rand.Reader, key[:]); err != nil {

cmd/hydroxide/hydroxide.go

@@ -138,6 +138,20 @@ func main() {
 		}
 
 		fmt.Println("Bridge password:", bridgePassword)
+	case "status":
+		usernames, err := auth.ListUsernames()
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		if len(usernames) == 0 {
+			fmt.Printf("No logged in user.\n")
+		} else {
+			fmt.Printf("%v logged in user(s):\n", len(usernames))
+			for _, u := range usernames {
+				fmt.Printf("- %v\n", u)
+			}
+		}
 	case "smtp":
 		port := os.Getenv("PORT")
 		if port == "" {

config/config.go

@@ -0,0 +1,27 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+)
+
+func Path(filename string) (string, error) {
+	configHome := os.Getenv("XDG_CONFIG_HOME")
+	if configHome == "" {
+		home := os.Getenv("HOME")
+		if home == "" {
+			return "", errors.New("HOME not set")
+		}
+		configHome = filepath.Join(home, ".config")
+	}
+
+	p := filepath.Join(configHome, "hydroxide", filename)
+
+	dirname, _ := filepath.Split(p)
+	if err := os.MkdirAll(dirname, 0700); err != nil {
+		return "", err
+	}
+
+	return p, nil
+}

imap/database/user.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/boltdb/bolt"
 
+	"github.com/emersion/hydroxide/config"
 	"github.com/emersion/hydroxide/protonmail"
 )
 
@@ -223,8 +224,13 @@ func (u *User) Close() error {
 	return u.db.Close()
 }
 
-func Open(path string) (*User, error) {
-	db, err := bolt.Open(path, 0700, nil)
+func Open(filename string) (*User, error) {
+	p, err := config.Path(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	db, err := bolt.Open(p, 0700, nil)
 	if err != nil {
 		return nil, err
 	}